Where, in the case of any proposal under section 69 of this Act, the requirements of section 71 of this Act are not satisfied, but—
(a) all the persons referred to in subsection (2) of this section agree on an alteration of the valuation list (whether the alteration is that specified in the proposal or another alteration); and
(b) the agreement is reached without, or before the determination of, any appeal to a local valuation court, or reference to arbitration, with respect to an objection to the proposal,
the valuation officer shall cause that alteration to be made in the valuation list.
The persons referred to in subsection (1)(a) of this section are—
(a) the valuation officer ;
(b) the person who made the proposal, where the proposal was not made by the valuation officer;
(c) any person who has served and who has not unconditionally withdrawn a notice of objection to the proposal;
(d) the occupier of the hereditament to which the proposal relates, if he is not included by virtue of paragraph (b) or (c) of this subsection ;
(e) the rating authority (if not included by virtue of paragraph (b), (c) or (d) of this subsection), unless they have notified the valuation officer that they do not desire to be included by virtue of this paragraph either generally or as respects a class of hereditament which includes the hereditament to which the proposal relates.